In case someone is interested in chess analysis software after the world championship final between Vishy Anand and Magnus Carlsen (now the new world champion):In my personal repo I have updated the chess database GUI ChessX to 1.0.0 and the (most powerful open-source) chess engine Stockfish to version 4.My repository joka-chess has no dependencies to any other 3rd party repos. Therefore I think it is safe to install chessx and stockfish by following commands: